A horizontal bar chart displays the 2019 population estimates for the ten most populous US states. The React application uses D3.js v5 to fetch CSV data from a GitHub gist, then maps state names to the y-axis and population values to the x-axis. SVG rectangles render the bars with a skyblue fill, while green gridlines and axis labels are generated using D3's scaleBand, scaleLinear, and tick functions.